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Cincinnati Society of Natural History. 



A transverse section of a subcylindrical projection shows the hollow 

 portion filled with clay (see fig. 2a). In a tangential section the 

 tubes are seen to be suboval or subcircular in outline, and the small 

 interstitial pores of much the same shapes (see fig. 2f). 



The best of three vertical sections taken from different parts of the 

 same corallum show only obscure (owing, seemingly, to the unusually 

 dark, translucent coenenchyma preventing the passage of light suf- 

 ficiently distinct) or doubtful tabulae, and a few convex vesicular 

 attachments to one side of some of the tube walls (see fig. 2g). The 

 walls are thin and slightly curved at the base, but just above they 

 become somewhat thickened, and take a direct vertical course to the 

 surface; this section is cut through one of the stellate spaces, which 

 portion shows a different arrangement of the tubes from that described 

 above (see fig. 2g). 



Fig. 2, part of a specimen (type) of Fistulipora oweni, James, showing general surface 

 features, natural size; 2a, transverse section of a projection, natural size, showing the 

 hollow interior filled with clay; 25, a small portion of the surface slightly enlarged, show- 

 ing one of the maculae and tube openings; 2c, same as 2&, but much more enlarged; 

 2d, the central part of this figure was intended to show the striate epitheca at the base of 

 the tubes, natural size; 2e, portion of the surface of a weathered specimen, much enlarged; 

 2/, part of a tangential section, enlarged to about same scale as 2c and 2e; 2g, part of a 

 vertical section, much enlarged, cut through one of the maculae. 



There is some resemblance in the surface markings of this species 

 to F. sp. siluriana, James, but in habit of growth and other respects 

 they differ widely. 



